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Official site of the design, build, test and launch of JWST.


Overview of the spacecraft, mission and science of JWST.

JWST related content on the NASA HOME PAGE plus links to NASA’s other great activities and missions.


JWST related Missions.


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The science instruments are the heart of the James Webb Space Telescope. The four science instruments are contained within the Integrated Science Instrument Module or ISIM. JWST's instruments will detect light from distant stars and galaxies, and planets orbiting other stars.

The ISIM structure (pictured below) is like a chassis in a car providing support for the engine and other components.

Integrated Science Instrument Module (ISIM) Structure

The ISIM includes the following instruments:

Instruments integrated in ISIM Structure

JWST Team Photo with completed Flight Instrument module:

JWST Team Photo with Completed Flight Instrument module

Many different smaller parts go into the whole ISIM structure. These include the ISIM Structure Subsystem; ISIM Thermal Control Subsystem; ISIM Control and Data Handling Subsystem; ISIM Flight Software; and ISIM Harness Assemblies.

ISIM Components within the Observatory

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